Observed Time Rhythms, vs. Revealed Time Rhythms

Teachers, you need a rhythm of work that includes rest.

These time periods are observed from the astronomical rhythms (which, of course, are God's design):
The day
The month
The year

But the concept of a week is a revelation from God.  There is nothing astronomical about a week.  While your body has a daily need for sleep, there is nothing 'natural' about needing a rest day each week.  These are revealed to us by God as good for us.  The Sabbath was made for man, not man for the Sabbath. (Mark 2:27)

Incorporate a day of rest in your teaching ministry.